In phonetics, a bilabial consonant is a consonant articulated with both lips. The bilabial consonants identified by the International Phonetic Alphabet (IPA) are:
bi·la·bi·al (b-l b-l) adj. 1. Pronounced or articulated with both lips, as the consonants b, p, m, and w. 2. Relating to both lips. n. A bilabial sound or consonant.